The Alaskan Way Viaduct's southbound lanes will be closed from Monday night to Tuesday morning between the Battery Street Tunnel and the West Seattle Bridge.

The closure will last from 10 p.m. to 5 a.m. The southbound ramps at Columbia Street and Elliott Avenue West will close one hour earlier, the state Transportation Department reports.

WSDOT needs to close the roadway to remove demolition equipment.

WSDOT is demolishing the final 1,100 feet of the viaduct's south end to make room for a tunnel construction zone. The central waterfront portion of the viaduct will be replaced with a deep-bore tunnel, which will be the largest-diameter bored tunnel in the world when it opens.

The south end of the viaduct has already been replaced with a new highway through Sodo.